Future Stewart Partners will operate and maintain the airport's terminal, landside and airfield and will also manage and develop the airport's concession programme and oversee air services development services.
Located 60 miles from Manhattan, Stewart International Airport is the fourth-largest airport in New York, handing 670,000 passengers in 2018.
It can be considered as one of the main gateways to the state, with strong potential for low-cost carriers in the United States.
Groupe ADP is one of the world's biggest airport operators and counts Paris CDG, Queen Alia in Jordan and Santiago's Comodoro Arturo Merino Benítez International Airport in Chile in its global airport portfolio.
AvPorts currently operates Albany, Republic and Winchester airports in New York.
According to Groupe ADP: "This unique combination of skills will allow Future Stewart Partners to deliver its ambitious vision to make New York Stewart International Airport the preferred New-York gateway for short and long-haul budget airlines."
The Port Authority of New York and New Jersey (PANYNJ) announced Future Stewart Partners as the winner of its process to find an operation, maintenance and concessions manager last September.
The recently ratified agreement sets a new course for growth at the airport over the next 10 years as it bids to become a regional hub and increase its appeal to international travellers.
The contract includes two extension options of five years and six months, respectively.
Groupe ADP chairman and CEO, Augustin de Romanet, says: “After the acquisition of the consulting company Merchant Aviation and after the win of several airport planning assignments for major airports, Groupe ADP is strengthening its footprint in the US.
"The management of New York Stewart International Airport is an opportunity for us to showcase our ability to transform the airport experience to the benefit of our future clients: airlines and passengers, but also the Port Authority of New York and New Jersey, as well as the Orange County community.”
While Jorge Roberts, CEO of AvPORTS, notes: “Future Stewart Partners is very proud to be selected by the Port Authority of New York and New Jersey, and excited to partner on this ambitious project to improve options and experiences for New York travelers.
"As part of its vision, Future Stewart Partners is committed to bringing New York Stewart International Airport to the next level. We will bring passengers the best experience possible, leveraging the renowned hospitality of both partners.”